Silencer for internal-combustion engines.



A. LEBEDEH'.

SILENCER FOR INTERNAL COMBUSTIONENGINES.

APPLICATION FILED FEB. I5. 1916.

1,217,021. Patented Feb. 20,1917.

' 9 IIIIIIII 2 8 v which are moved at a great not diminish the power ofthe motor in an tion, such as will view, whereas ALEXIS LEBEDEFF, OFPETROGRAD, RUSSIA..

SILENCER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Application led February 15, 1916. Serial No. 78,474.

T0 all whom t may concern:

jBe it known that I, ALEXIS LEBEDEFF, a subject of the Emperor ofRussia, residing at VVassili Ostrow, 11 line, house No. 3, Petrograd,Russia, have invented' certain new and useful Improvements in Silencersfor Internal-Combustion Engines; and I do hereby declare the followingto be a full, clear, and exact description of the invenenable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters andfigures of reference marked thereon, which form a part of thisspecification.

The hitherto proposed silencers or apparatuses designed to suppress thenoise produced by the bustion motors do this work, as is well-known,only in a very unsatisfactory manner; nevertheleSs they absorb aconsiderable percent. of the power of the motor. To attain a good resultwith a minimum ofl power absorbed by the silencer, the same mustaproducea rapidcooling of the hot gases and as little as possible embarrass theoutput of them.

Now the object of this invention is a new type of silencers for internal,combustion motors generally and especially for those used on iyingmachines of any kind and motor vehicles, which silencer, being verysimple in construction, does nevertheless its work with good result and,when used on aeroplanes or 'other bodies or structures, velocity, doesappreciable manner.

Figure 1 of the drawings shows an embodiment of my new silencer partlyin a longitudinal section and partly in a side of same and Fig. 3 across section on line A-B of Fig. 1.

The new silencer comprises an outer shell l of thin metal sheet,eccentrically fixed on th'e end vofithe exhaust tube 7 of the motor, aninner conical tube 2 tightly connected at its larger end to the rear endof the said shell 1and a large cylindrical pipe 5 tightly r fixed to thefront end of the same shell and the rear end 4 of `which isprogressively diminished in diameter to such an extent `that end of theconical tube between the same and the Vnarrower front 2 is left a slot3, through which the annular chamber 6,

exhaust gases of internal com Fig.y 2 is a front end view formed by thesaid shell l, and tubes 2 and 4, communicates with the cone 2. 8 and 9designates .metal strips by which the pipe 4.-, 5 and the cone 2respectively are connected or suspended to the outer shell l with a viewto increase thenner rigidity of the apparatus.

The outer shell 1 has preferablythe form of a cigar or grenade orgenerally of a body which gives the smallest possible resistance uponthe air.

As appears from Figs.' '1 and 2, the exhaust gases are by the pipe 7introduced into the in such a direction that the hot gases are inducedto move along this space in a spiral travel.

When the flying machine or, generally speaking, the body supporting asilencer of the described kind is moved in the direction indicated bythe arrow zz/1, the air How produced thereby around the shell the pipe 5and cone 2 in the direction of the arrow y will, rstly, energeticallycool the metallic walls and thereby also the gases circulating withinthe space 6 and, secondly, draw these latter through the circular slot 3into the cone 2 and out of this latter. Experience has shown that asilencer of this kind, duly dimensioned for a given motor, works at adistinct apparatus in the direction of thearrow m without absorbinganyappreciable amount of power from the motor, and with a very goodresult as far as the suppressing of noise is concerned.

What I claim is:

1. AY silencer for internal combustion yengines, comprising an 'outermetallic shell, a large inner pipe tightly connected to the front endofthe said shell and having a successively contracted rear end, atruncated cone tightly fixed at its large end to therear i end of thesaid shell and encircling with its successively contracted rear end, atruncated Y free annular space 6 of the silencery l and withinv velocityof motion of the Patented Feb. 2o, 1917.'

A annular space cone tightly fixed at its large end to the rear l xed atits large end to the rear end of the said shell and encircling with itsnarrowerv front end the rear end of the saidpipe so as to form acircular slot, and ymeans for eccentrically introducing into the freean.

- nularv space formed' by .the said shell, pipe and cone, the hotexhaust gases.

4. A silencer for internal combustion engines the rear end of the saidlfeeding the hot exhaust gases, a large inner pipe tightly connected tothe ,front end of the said shell and having a successively contractedrear end, a truncated cone tightly v ixed at its large end to the rear.end of the said shell and encircling with its narrower front end therear end of the said pipe so as to form circular slot, and means foreccentrically introducing into the free annular space formed by the'said shell, pipe and cone, the hot exhaust gases.

ln testimony that I claim the foregoing v comprising an outer metallicshell ec- `centrically mounted uponcthe end of a tube as my inventionl Ihave signed' my name 1n c.

presence oi' two subscribing Witnesses.

y Witnesses:

INrNcnn, R. LOVIAGHIN.

' Anniiis LnBEnnnF.

